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PVC foam ( poly vinyl coloride)

The wide range of compressive deformation offers with excellent advantages wet damper. PVC foam is obtained through a combination of different kind of software and from 2ways of physical and chemical. This foam can be as soft, open cell, semi open cell, semi hard, close hard cell. Hard PVC foam is more expensive than polyurethane. Compared to another plastics used in thermal expansion PVC has high strength resistance and is so hard. Hard PVC foam is a good sound and heat damper and penetration of wet and vapor is very low. Due to high shear strength its surface is good for applying cement and plaster. PVC foam has better performance against fire than another polymer foam. So panels structure have been accepted in marine application in Europe.

Polyurethane foam:

The advantages includes: low thermal conductivity. Light weight and high strength, high ability in accepting changes in formulation for estimating the expectations, high adhesive to materials, low permeability to water vapor, heat resistance at temperature over 100 C0 , the ability to be in form of foam in place of filling complex forms.